Installation: Connect your Sense HAT to the Raspberry Pi via the 40 GPIO Pins Open up a terminal and run the following command: wget -O - http://www.raspberrypi.org/files/astro-pi/astro-pi-install.sh --no-check-certificate | bash (This will take approximately 5 minutes to run on the Raspberry Pi 2 Model B, and approximately 20 minutes on earlier models of the Raspberry Pi) When the install is finished you will need to reboot your Raspberry Pi.
The Sense HAT is an add-on board for Raspberry Pi, made especially for the Astro Pi mission – it launched to the International Space Station in December 2015 – and is now available to buy